Improvement in adjustable reversible propellers



UNITED STATES PATENT OEEICE.

AARON B. COOLEY, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENTIN ADJUSTABLE REVERSIBL PROPELLERS.

Specification forming part of Letters Patent No. 35,219, dated May 13,1862.

To @ZZ whom it may concern: l1. This ring F tits snugly, but so as toslide 13e 1t known that I, AARON B. COOLEY, of freely on the outside ofthe casing, in which, Philadelphia, Pennsylvania, have inventedr as wellas in the annular projection d, are an Improvement 1n AdjustablePropellers; formed openings for the free movement of and I do herebydeclare the following to be a i the projections i' and t" and links Eand E. full, clear, and exact description of the same, On the outside ofthe ring F is eut a recess reference being had to the accompanying i forthe reception of the ring .I which is made drawings, and to the lettersof reference of two pieces bolted together at y' and conmarked thereon.I

My invention consists of a screw-propeller forked end of the lever N,which has its fulconstructed and operating as described herecrum on apin passing through a bracket, u, inafter, so that the blades may bereversed, secured to the stern-post or to the stationary therebyrendering the propeller a portion of bearing B.

a left-handed or a portionof a right-handed The casing D, two bla-des IIand H', arms screw at pleasure, without interfering with G and G', linksE and E', and the ring F, the mot-ion ot' the propeller-shaft. with itsprojections, revolve with the propel- In order to enable others to makeand use ler-shaft O, while the ring J has no other my invention, I willnow proceed to describe movement than that which may be imparted nectedby the two links M and M to the its construction and operation. to it bymeans of the forked lever N.

On reference to the accompanying' draw Then the ring F has been pushedto the ings, which form a part ot' this specification, limit of itsmovement in the direction of the Figure l is a side view of my improvedadarrow, the blade H. will have assumed the pojustable and reversiblepropeller; Fig. 2, an sition illustrated by the line and the blade endview, partly in section; and Fig. 3, a sech the position shown by theline y. Then tional view. the ring F, however, has been moved to itsSimilarletters referto similar parts throughfull extent in thedirect-ion contrary to that out the several views. pointed out by thearrow, the blade repre- The line A represents the outside of the sentedby the line '.r will assume the position stern-post of the vessel, towhich is secured shown bythe line 1] and thelatter the position thebearing B for the projecting end of the shown by the line It will thusbe seen propeller-shaft (l. that by the movement of the lever N the di-D is a hollow cylindrical casing with a rection of the blades may beinstantly rerounded outer end, and in the interior of this versed, so asto convert the propeller formed casing and forming part of the same isthe by the blades from a right-handed to a leftannular projection d, towhich the project` handed screw, thereby allowing the attending end ot'the propeller-shaft C is firmly se ant to change the direction of thevessel withcured. From the inside of the casing and out interfering`with the continuous rotation near the rounded end of the same projectsof the propeller-shaft in one direction. the two hubs e and e', onebeing situated di- My invention is especially applicable to rectlyopposite the other, and into the hub e propeller vessels of smallersize-such as are the stem h of the blade H fits snugly, but so used oncanals-as it obviates the necessity of as to turn freely, the stem h ofthe bla-de H close attendance to the revolving gear of the fitting intothe opposite hub, e. Each blade engine. consists of a simple iiat pla-teof cast-iron, Another important object of my invention malleable iron,or brass, the stem either formis the facility with which the blades ofthe ing a part of or being firmly secured to the propeller can beadjusted so as to present a plate. coarser or finer threaded screw atpleasure, To the stem 72 of the blade Il is secured an which adjustmentwill depend upon thejudg arm, G, and to the stem t of the blade H isment of the attendant, who will be guided by secured a similar arm, G',the latterbeing conthe increased or diminished loading of the neeted toa projection, i, on the ring F by a vessel and the extent of duty to beaecomlink, E, while the arm G is connected by a plished by the engineand propeller.

link, E', to a projection, i', on the same ring, Although I have shownthe ring F as arranged lfor being operated by a lever, N, it will beevident that it may be moved haek- Ward and forward over the easing Dbyraeks and pinions and other appliances which will readily suggestthemselves to experienced engineers.

I wish it to be understood that I do not desire to Claim, broadly, apropeller the blades of which can be adjusted to different angles; but

I claim as my invention and as an improvement in that class ofpropelle'rs-v The blades H and I'I, arms G and G ,links E and Ethe'sliding` ring F, and ring J, when d the whole of the above parts arearranged on the hollow hub or easing D for joint action, as set forth,and when the said ring J is operated by the links M and M and lever N,or their equivalents, as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

AARON B. COOLEY.

IVitnesses:

HENRY HoWsoN JOHN WHITE.

